My Roku Express volume is too Low when playing Dolby Digital 5.1. For example, if I'm watching a show on The Roku Channel that is in stereo the volume is normal. If I switch to a show on The Roku Channel that is in DD 5.1 the volume is too low. I can turn the volume up so I can hear the audio but if I forget to turn it back down before I switch to a stereo channel it blasts me. This is especially bad when I stop watching and my wife starts watching a stereo show. It immediately also makes my wife's volume too high when she is letting me know about it.
I use a HDMI switch to share my TV HDMI input with another device. That device has the same volume level whether I'm watching a show with stereo audio or DD 5.1.